An improved small antenna radiation-efficiency measurement method

An examination of the available literature shows that the accurate measurem ent of antenna efficiency is a difficult task, and that the available metho ds have potential for a substantial amount of error. This paper refines a m ethod already presented, and gives detailed results with some newly defined reference antennas. Two methods of determining antenna efficiency are pres ented. One method may be considered to be a generalization of the "Wheeler cap method." The two methods presented show excellent agreement with each o ther, and show excellent agreement with the reference antennas. The reflect ion method appears to give the better results of the two methods, except un der special circumstances.